Actually, the Morse (not Morris) taper is only one of several self-seating
tapers used in machine tools to secure cutting tools in the machine tool's
spindle. It's taper varies depending on the size of the taper, but it is
about 5/8" per foot. Other machine tool tapers, such as Brown and Sharpe
tapers, have tapers as high as .5 to .75" per foot. Taper pins are a
different animal - the standard taper for both American (ASA B5.20-1958) and
British (BS 46: Part 3:1951) Standard Tapers, for use in taper pins, is 1/4"
per foot. Tapers used on tie rod ends, etc, do not necessarily follow any
of the above standards, especially if they are not designed to be self
seating. Tapered joints secured with a nut probably have a greater taper
than .75" per foot, I suspect.
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